package com.fu.servlet;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Enumeration;

/**
 * @author 付大大
 * @description
 * @create 2021-01-23 20:11
 */
public class ServletConfigDemo extends HttpServlet {

    private ServletConfig config;

    @Override
    public void init(ServletConfig config) throws ServletException {
        this.config = config;
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String encodingValue = config.getInitParameter("encoding");
        System.out.println(encodingValue);

        Enumeration<String> initParameterNames = config.getInitParameterNames();
        while (initParameterNames.hasMoreElements()) {
            String key = initParameterNames.nextElement();
            String value = config.getInitParameter(key);

            System.out.println(key + "----" + value);
        }

        String servletName = config.getServletName();
        System.out.println(servletName);

        ServletContext servletContext = config.getServletContext();
        System.out.println(servletContext);

        Object username = servletContext.getAttribute("username");
        System.out.println(username);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}
